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Gotowa bibliografia na temat „Cobalt ferrite thin film”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Cobalt ferrite thin film"

Elsayed, Elsayed M., Hazem F. Khalil, Ibrahim A. Ibrahim, Mostafa R. Hussein i Mohamed M. B. El-Sabbah. "The Significance of Buffer Solutions on Corrosion Processes of Cobalt Ferrite CoFe2O4 Thin Film on Different Substrates". Combinatorial Chemistry & High Throughput Screening 23, nr 7 (5.10.2020): 599–610. http://dx.doi.org/10.2174/1386207323666191217130209.

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Background: The spinel ferrite nanoparticles, such as zinc, nickel, and cobalt ferrites have exceptional electronic and magnetic properties. Cobalt ferrite nanomaterial (CoFe2O4) is a hard material that reveals high magnetic, mechanical, and chemical stability. Aim and Objective: The objective of this research is to predict the corrosion behavior of cobalt ferrite (CoFe2O4) thin films deposited on different substrates (platinum Pt, stainless steel S.S, and copper Cu) in acidic, neutral, and alkaline medium. Materials and Method: Cobalt ferrite thin films were deposited on platinum, stainless steel, and copper via electrodeposition-anodization process. After that, corrosion resistance of the prepared nanocrystalline cobalt ferrite on different substrates was investigated in acidic, neutral, and alkaline medium using open circuit potential and potentiodynamic polarization measurements. The crystal structure, crystallite size, microstructure, and magnetic properties of the ferrite films were investigated using a combination of XRD, SEM and VSM. Results: The results of XRD revealed a cubic spinel for the prepared cobalt ferrite CoFe2O4. The average size of crystallites was found to be about 43, 77, and 102 nm precipitated on platinum, stainless steel, and copper respectively. The magnetic properties of which were enhanced by rising the temperature. The sample annealed at 800oC is suitable for practical application as it showed high magnetization saturation and low coercivity. The corrosion resistance of these films depends on the pH of the medium as well as the presence of oxidizing agent. Conclusion: Depending on the obtained corrosion rate, we can recommend that, CoFe2O4 thin film can be used safely in aqueous media in neutral and alkaline atmospheres for Pt and Cu substrates, but it can be used in all pH values for S.S. substrate.

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Basantakumar Sharma, H. "Multiferroic bismuth ferrite thin film and bismuth ferrite-cobalt ferrite nanocomposites". Ferroelectrics 516, nr 1 (18.08.2017): 90–97. http://dx.doi.org/10.1080/00150193.2017.1362289.

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Barbosa, J. G., Bernardo G. Almeida, João P. Araújo, João Bessa Sousa i Jorge A. Mendes. "Structural and Magnetic Properties of Nanogranular BaTiO₃-CoFe₂O₄ Thin Films Deposited by Laser Ablation on Si/Pt Substrates". Materials Science Forum 587-588 (czerwiec 2008): 303–7. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.303.

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Thin film nanocomposites of cobalt ferrite (CoFe2O4) dispersed in barium titanate (BaTiO3) matrix, have been deposited with different cobalt ferrite concentrations (from 20% to 70% CoFe2O4), as well as pure barium titanate and cobalt ferrite thin films (end members). The films were prepared by pulsed laser ablation on platinum covered Si(001) substrates. The films structure was studied by X-ray diffraction and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured in a SQUID magnetometer. The results show that the deposited films are polycrystalline with a slight (111) barium titanate phase orientation and (311) CoFe2O4 phase orientation. The grain sizes measured from the X-ray diffraction peak widths, for both phases, are in the range 40nm to 100nm. However, as the concentration of the cobalt ferrite increases, the grain size of the BaTiO3 phase decreases, from 100nm to 30nm, up to 40% CoFe2O4 concentration beyond which the BaTiO3 grain size has an approximately constant value near 30nm. On the other hand the cobalt ferrite grain size does not show a clear trend with increasing cobalt ferrite concentration, fluctuating in the range 20nm to 30nm. The magnetic measurements show an increase of the magnetic moment from the low concentration region where the magnetic grains are more isolated and their magnetic interaction is small, towards the bulk value at higher CoFe2O4 concentrations. Also, a strong reduction of the magnetization with increasing temperature was observed, due to the corresponding decrease of the magnetocristalline anisotropy of the cobalt ferrite.

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Thien, Jannis, Jascha Bahlmann, Andreas Alexander, Kevin Ruwisch, Jari Rodewald, Tobias Pohlmann, Martin Hoppe i in. "Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001)". Materials 15, nr 1 (22.12.2021): 46. http://dx.doi.org/10.3390/ma15010046.

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Here, we present the (element-specific) magnetic properties and cation ordering for ultrathin Co-rich cobalt ferrite films. Two Co-rich CoxFe3−xO4 films with different stoichiometry (x=1.1 and x=1.4) have been formed by reactive solid phase epitaxy due to post-deposition annealing from epitaxial CoO/Fe3O4 bilayers deposited before on Nb-doped SrTiO3(001). The electronic structure, stoichiometry and homogeneity of the cation distribution of the resulting cobalt ferrite films were verified by angle-resolved hard X-ray photoelectron spectroscopy. From X-ray magnetic circular dichroism measurements, the occupancies of the different sublattices were determined using charge-transfer multiplet calculations. For both ferrite films, a partially inverse spinel structure is found with increased amount of Co3+ cations in the low-spin state on octahedral sites for the Co1.4Fe1.6O4 film. These findings concur with the results obtained by superconducting quantum interference device measurements. Further, the latter measurements revealed the presence of an additional soft magnetic phase probably due to cobalt ferrite islands emerging from the surface, as suggested by atomic force microscope measurements.

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Sharma, Deepanshu, Neeraj Khare i Mahesh P. Abegaonkar. "Magnetically tunable bandpass filter using cobalt ferrite thin film". Solid State Communications 230 (marzec 2016): 40–42. http://dx.doi.org/10.1016/j.ssc.2016.01.014.

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Soe, Thiha, Arthit Jityen, Teerakorn Kongkaew, Kittitat Subannajui, Asawin Sinsarp i Tanakorn Osotchan. "Atomic structure of cobalt doped copper ferrite thin film". Materials Today: Proceedings 23 (2020): 752–56. http://dx.doi.org/10.1016/j.matpr.2019.12.269.

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Martens, J. W. D., i W. L. Peeters. "Anisotropy in Cobalt-Ferrite thin films". Journal of Magnetism and Magnetic Materials 61, nr 1-2 (wrzesień 1986): 21–23. http://dx.doi.org/10.1016/0304-8853(86)90062-4.

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Joshi, Chhatra R., Mahendra Acharya, Md Sariful Sheikh, John Plombon i Arunava Gupta. "Effect of cobalt substitution on the structural, ferroelectric, and magnetic properties of bismuth ferrite thin films". Journal of Applied Physics 132, nr 19 (21.11.2022): 194102. http://dx.doi.org/10.1063/5.0116794.

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Epitaxial films of multiferroic BiFe[Formula: see text]Co[Formula: see text]O[Formula: see text] (BFCO) with [Formula: see text] are grown on (001)-oriented SrTiO[Formula: see text] and SrRuO[Formula: see text] buffered SrTiO[Formula: see text] substrates using the pulsed laser deposition technique. The effect of structural transformation from rhombohedral to tetragonal phase with increasing cobalt substitution on the magnetic, electrical, and piezo-/ferroelectric properties is investigated. Piezoresponse force microscopy is used to quantify the coercive voltage from the phase hysteresis loops for different thickness films to investigate the semi-empirical Kay–Dunn scaling law with varying cobalt concentrations. For the rhombohedral structure, a reduction of the coercive voltage is observed with increasing substitution of Fe by Co. The coercive voltage of a 10 nm BFCO ([Formula: see text]) film is found to be 0.63 V, which is 67% lower than that of a pure BiFeO[Formula: see text] (BFO) (1.9 V) film of the same thickness. Cobalt substitution also leads to changes in the magnetic and electrical properties due to modification of spin ordering and reduction of the bandgap, respectively. Further, to validate the experimental results, we have performed theoretical calculations using density functional theory. The theoretical results indicate a reduction in unit cell volume and enhancement in net magnetization can be achieved with cobalt substitution, in agreement with experimental results. Partial Co substitution can, thus, provide a pathway to realize BFO-based nonvolatile magnetoelectric devices with reduced operating voltage.

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Ramli, Ramli, Riri Jonuarti i Ambran Hartono. "ANALISIS STRUKTUR NANO DARI LAPISAN TIPIS COBALT FERRITE YANG DIPREPARASI DENGAN METODE SPUTTERING". EKSAKTA: Berkala Ilmiah Bidang MIPA 18, nr 01 (28.04.2017): 46–53. http://dx.doi.org/10.24036/eksakta/vol18-iss01/16.

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In this paper we report the results of studies relating to the synthesis of Cobalt Ferrite (CoFe2O4) thin films by a sputtering method. The CoFe2O4 thin film has been prepared onto silicon substrate from the sputtering targets, CoFe. Structural propertiesofthinfilms were characterized byx-ray diffraction and the morphology was characterized by scanning electron microscopy. The growth parameter are: base pressure 2,8 x 10-2 Torr, ratio of Argon:Oxygen flow rate are 100:50 sccm, deposition pressure 5.4 x10-1 Torr, growth temperature 100oC.Nanostructures of the thin film that have been analyzed are crystallite size and micro strain.We obtained the crystallite size of CoFe2O4 thin films for layer thickness of 40 and 48 nm, respectively are: 32 nm and 66 nm, while the micro strain is 8.0 x 10-4 and 10.2 x 10-4.

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Prasad, Rishu, i S. K. S. S Parashar. "Structural and electromagnetic properties of nano cobalt ferrite polymeric thin film". Journal of Materials Science: Materials in Electronics 30, nr 13 (28.05.2019): 12023–30. http://dx.doi.org/10.1007/s10854-019-01559-8.

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Rozprawy doktorskie na temat "Cobalt ferrite thin film"

Spillane, Liam Jonathan. "Nanoanalytical electron microscopy of cobalt ferrite thin films". Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6447.

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Electron energy‐loss spectroscopy (EELS) is a powerful method for providing detailed information on the bonding, chemical structure and electronic structure of materials. In this work, EELS has been used to correlate variations in magnetic properties of cobalt ferrite films with film thickness and post‐processing conditions. Magnetometry performed on as‐deposited and oxygen post‐annealed films has shown saturation magnetization (Ms) to be strongly affected by post processing. This has been attributed to an enhancement in superexchange by reoxidation and cation ordering processes during post‐anneal. To date this has not been confirmed using nanoanalytical techniques. This work addresses this issue. In particular, it is of interest to determine local changes in the degree of inversion of the ferrite spinel in order to link local chemical changes to bulk magnetic properties. Two sample preparation techniques were used to produce electron transparent sections – conventional ion beam milling and focussed ion beam (FIB) milling using a dual beam system. The suitability of each technique is discussed in terms of, sample damage, thickness, reproducibility and reliability. Aberration corrected HRTEM was used to investigate the microstructure of the thin films. Lattice strain and defect strain were quantified at increasing distance from the substrate/interface in as‐deposited and oxygen post‐annealed cobalt ferrite films and structural defects responsible for misfit accommodation were characterised. Local variation in cation valence and coordination cobalt in an oxygen post‐annealed film was investigated by monochromated EELS of the iron and cobalt L2,3‐edges in the electron energy‐loss spectrum. A method to determine the spinel degree of inversion (λ) by multiple linear least squares fitting was developed using data acquired from reference materials. A commercially available full multiple scattering code (FEFF 8.2) was used to aid interpretation of reference spectra and the fitting technique used to determine λ was applied to the cobalt ferrite thin film in order to identify variations in λ.

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Ramos, Ana V. "Epitaxial Cobalt-Ferrite Thin Films for Room Temperature Spin Filtering". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00394398.

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Le filtrage de spin est un phénomène physique qui permet de générer des courants d'électrons polarisés en spin grâce au transport sélectif à travers une barrière tunnel magnétique. Dans cette thèse, nous présentons une étude du matériau ferrite de cobalt (CoFe2O4), dont le caractère isolant et la température de Curie élevée en font un très bon candidat pour le filtrage de spin à température ambiante. L'élaboration des couches minces de CoFe2O4 a été réalisée par épitaxie par jets moléculaires assistée par plasma d'oxygène. Les propriétés structurales, chimiques et magnétiques ont été étudiées par plusieurs méthodes de caractérisation in situ et ex situ. Des jonctions tunnel à base de CoFe2O4 ont été préparées pour des mesures de transport tunnel polarisé en spin, soit par la méthode de Meservey-Tedrow, soit par des mesures de magnétorésistance tunnel (TMR). Dans ce dernier cas, nous avons porté une attention particulière au retournement magnétique de la barrière tunnel de CoFe2O4 et de la contre électrode magnétique (Co ou Fe3O4), une étape cruciale avant toute mesure de TMR. Dans les deux cas, les mesures de transport tunnel polarisé en spin ont révélé des polarisations significatives du courant tunnel à basse température, et à température ambiante pour les mesures de TMR. Par ailleurs, nous avons trouvé une dépendance unique entre la TMR et la tension appliquée qui reproduit celle prédite théoriquement pour les barrières tunnel magnétiques. Nous démontrons ainsi que les barrières tunnel de CoFe2O4 constituent un système modèle pour étudier le filtrage de spin dans une large gamme de températures.

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Stichauer, Libor. "Étude des propriétés optiques et magnéto-optiques de films nanocristallins de ferrite de cobalt". Nancy 1, 1994. http://www.theses.fr/1994NAN10365.

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Ce mémoire concerne l'étude des propriétés optiques et magnéto-optiques dans le domaine visible proche infrarouge, de films de ferrite de cobalt de structure nanocristalline. Nous avons en particulier déterminé le coefficient d'absorption et la rotation faraday. Les films sont préparés par pulvérisation cathodique radiofréquence de cibles d'oxydes en présence d'un faible flux d'oxygène. Ce matériau est un support potentiel d'enregistrement magnéto-optique à haute densité. L'obtention des spectres d'absorption des films à partir des données spectrophotometriques a nécessité la mise au point d'une méthode spécifique de dépouillement des données. Les résultats obtenus montrent l'existence de désordres topologique et magnétique croissant avec le flux d'oxygène, ce qui a déjà été révélé par des techniques macroscopiques. Les résultats originaux sont la mise en évidences d'une brisure de symétrie de l'environnement octaédrique des cations, et l'existence du désordre magnétique sur les deux sites cationiques du spinelle. Ceci doit servir de guide à une étude microstructurale approfondie

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Martin, Élodie. "Modulation de l'anisotropie dans le ferrite de cobalt en couches minces pour des applications en électronique de spin". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE026/document.

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Le domaine de l’enregistrement magnétique est en constante évolution pour repousser davantage les limites de stockage de l’information, une approche prometteuse étant l’enregistrement perpendiculaire. Le matériau faisant l’objet de ce manuscrit est le ferrite de cobalt CoFe2O4 (= CFO). Ses propriétés font de lui un candidat prometteur pour la réalisation de dispositif à enregistrement perpendiculaire, cela passant par le contrôle de sa direction de facile aimantation.Ce travail de thèse traite ainsi de la modification de l’anisotropie magnétocristalline du CFO en couche mince par dopage aux éléments de terres rares. Nous avons démontré la possibilité de moduler la direction de facile aimantation du CFO non dopé, en modifiant la pression partielle en O2/N2 lors de l’élaboration. Nous avons également mis en évidence l’insertion des éléments lanthanides dans la structure du CFO ainsi que l’impact de l’anisotropie de la terre rare sur les propriétés magnétiques du matériau
The field of magnetic storage is in constant progress to constantly push further the storage capacity of the device. A promising approach is the perpendicular magnetic recording of datas. The material presented in this manuscript is cobalt ferrite. It is an excellent candidate for the realization of perpendicular storage device due to its properties. The present work deals with the modification of the magnetic anisotropy by doping the ferrite cobalt thin films with rare earth elements. We have demonstrated the possibility to modulate the easy magnetization axis of undoped cobalt ferrite by changing the partial pressure of O2/N2 during the elaboration of the thin films. We have also highlighted the insertion of rare earth elements into the structure of the cobalt ferrite although their important ionic radii. The impact of the rare earth anisotropy on the magnetic properties of the ferrite cobalt has also been observed

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Mukherjee, Devajyoti. "Growth and Characterization of Epitaxial Thin Films and Multiferroic Heterostructures of Ferromagnetic and Ferroelectric Materials". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3622.

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Multiferroic materials exhibit unique properties such as simultaneous existence of two or more of coupled ferroic order parameters (ferromagnetism, ferroelectricity, ferroelasticity or their anti-ferroic counterparts) in a single material. Recent years have seen a huge research interest in multiferroic materials for their potential application as high density non-volatile memory devices. However, the scarcity of these materials in single phase and the weak coupling of their ferroic components have directed the research towards multiferroic heterostructures. These systems operate by coupling the magnetic and electric properties of two materials, generally a ferromagnetic material and a ferroelectric material via strain. In this work, horizontal heterostructures of composite multiferroic materials were grown and characterized using pulsed laser ablation technique. Alternate magnetic and ferroelectric layers of cobalt ferrite and lead zirconium titanate, respectively, were fabricated and the coupling effect was studied by X-ray stress analysis. It was observed that the interfacial stress played an important role in the coupling effect between the phases. Doped zinc oxide (ZnO) heterostructures were also studied where the ferromagnetic phase was a layer of manganese doped ZnO and the ferroelectric phase was a layer of vanadium doped ZnO. For the first time, a clear evidence of possible room temperature magneto-elastic coupling was observed in these heterostructures. This work provides new insight into the stress mediated coupling mechanisms in composite multiferroics.

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Roos, Andreas. "Growth and characterization of advanced layered thin film structures : Amorphous SmCo thin film alloys". Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-177674.

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This report describes the growth and characterization of thin amorphous samarium-cobalt alloy films. The samarium-cobalt alloy was grown by DC magnetron sputtering in the presence of an external magnetic field parallel to the thin film. The external magnetic field induces a uniaxial in-plane magnetic anisotropy in the samarium-cobalt alloy. The thin films were characterized with x-ray scattering, and the magnetic anisotropy was characterized with the magneto optic Kerr effect. The measurements showed a uniaxial in-plane magnetic anisotropy in the samarium-cobalt alloy films. It is not clear how amorphous the samples really are, but there are indications of crystalline and amorphous areas in the alloys.

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Srinivasan, Durgam Rangaswamy. "The structure and properties of cobalt -nickel thin film magnetic recording tapes". Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255841.

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Amiri-Hezaveh, A. "Photelectron spectroscopy of ultra-thin epitaxial f.c.c. magnetic films of iron and cobalt". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233668.

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Takano, Kentaro. "Exchange anisotropy in thin film bilayers of nickel cobalt monoxide and various ferromagnetic materials /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9820884.

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Kretzschmar, B. S. M., K. Assim, Andrea Preuß, A. Heft, Marcus Korb, Marc Pügner, Thomas Lampke, B. Grünler i Heinrich Lang. "Cobalt and manganese carboxylates for metal oxide thin film deposition by applying the atmospheric pressure combustion chemical vapour deposition process". Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21422.

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Coordination complexes [M(O2CCH2OC2H4OMe)2] (M = Co, 4; M = Mn, 5) are accessible by the anion exchange reaction between the corresponding metal acetates [M(OAc)2(H2O)4] (M = Co, 1; M = Mn, 2) and the carboxylic acid HO2CCH2OC2H4OMe (3). IR spectroscopy confirms the chelating or μ-bridging binding mode of the carboxylato ligands to M(II). The molecular structure of 5 in the solid state confirms a distorted octahedral arrangement at Mn(II), setup by the two carboxylato ligands including their α-ether oxygen atoms, resulting in an overall two-dimensional coordination network. The thermal decomposition behavior of 4 and 5 was studied by TG-MS, revealing that decarboxylation occurs initially giving [M(CH2OC2H4OMe)2], which further decomposes by M–C, C–O and C–C bond cleavages. Complexes 4 and 5 were used as CCVD (combustion chemical vapour deposition) precursors for the deposition of Co3O4, crystalline Mn3O4 and amorphous Mn2O3 thin films on silicon and glass substrates. The deposition experiments were carried out using three different precursor solutions (0.4, 0.6 and 0.8 M) at 400 °C. Depending on the precursor concentration, particulated layers were obtained as evidenced by SEM. The layer thicknesses range from 32 to 170 nm. The rms roughness of the respective films was determined by AFM, displaying that the higher the precursor concentration, the rougher the Co3O4 surface is (17.4–43.8 nm), while the manganese oxide films are almost similar (6.2–9.8 nm).

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Książki na temat "Cobalt ferrite thin film"

Srinivasan, Durgam Rangaswamy. The structure and properties of cobalt - nickel thin film magnetic tapes. Uxbridge: Brunel University, 1990.

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Części książek na temat "Cobalt ferrite thin film"

Abe, Masanori. "Ferrite Films Synthesized from Aqueous Solution and Their Applications". W Nano-Crystalline and Thin Film Magnetic Oxides, 27–42. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4493-3_2.

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Nikitov, S. A., Yu V. Gulyaev i Yu A. Filimonov. "Non-Linear Microwave and Magneto-Optical Properties of Ferrite Films". W Nano-Crystalline and Thin Film Magnetic Oxides, 79–92. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4493-3_5.

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Shah, Jyoti, Rekha Gupta i R. K. Kotnala. "Colossal Humidoresistance Inducement in Magnesium Ferrite Thin Film Led to Green Energy Device Invention: Hydroelectric Cell". W Recent Advances in Thin Films, 389–411. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6116-0_13.

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Lee, Keun Woo, Keun Jun Kim, Woo Ho Jeong, Tae Yong Park i Hyeong Tag Jeon. "Cobalt Thin Film Deposited by Remote Plasma Atomic Layer Deposition Method Using C₁₂H₁₀O₆(Co)₂ and CpCo(CO)₂". W Solid State Phenomena, 359–62. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.359.

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Chebwogen, Judith, i Christopher Mkirema Maghanga. "Fabrication and Characterization of Cobalt-Pigmented Anodized Zinc for Photocatalytic Application". W Thin Films. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.93790.

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Population growth and urbanization have led to water scarcity and pollution, which is a health hazard not only to humans but also to the ecosystem in general. This has necessitated coming up with ways of treating water before consumption. Photocatalysis has proved to be one of the most promising cheap techniques that involve chemical utilization of solar energy. TiO2 widely used in photocatalysis absorbs a narrow range of the solar spectrum compared to ZnO. In this regard, this study aimed at preparing and optimizing cobalt-pigmented ZnO, which is applicable in photocatalytic water treatment. The objectives in this study were to fabricate zinc oxide (ZnO) thin films by anodization, pigment the fabricated films with varying cobalt concentrations, characterize the fabricated films optically, and investigate the cobalt-pigmented ZnO’s performance in the methylene blue degradation under UV light irradiation. Mirror-polished zinc plates were sonicated in ethanol and rinsed. Anodization was done at room temperature in 0.5 M oxalic acid at a constant voltage of 10 V for 60 min, and cobalt electrodeposited in the films. Post-deposition treatment was done at 250°C. Optical properties of the films were studied using a UV-VIS- NIR spectrophotometer in the solar range of 300–2500 nm. The photocatalytic activity of the fabricated films was studied in methylene blue solution degradation in the presence of UV light irradiation for 5 h. Cobalt pigmenting was observed to reduce reflectance and optical band gap from 3.34 to 3.10 eV indicating good photocatalytic properties. In this study, ZnO film pigmented with cobalt for 20 s was found to be the most photocatalytic with a rate constant of 0.0317 h−1 and hence had the optimum cobalt concentration for photocatalytic water treatment. This can be applied in small-scale water purification.

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YOSHINO, Takako, Nobuyoshi BABA i Kenji YAMAGA. "ELECTROCHROMIC PROPERTIES OF COBALT OXIDE THIN FILM ON ITO". W Advanced Materials '93, 371–74. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-4832-8380-7.50091-2.

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Singh, Devinder, i Kuldeep Chand Verma. "Magnetic Properties of Heusler Alloys and Nanoferrites". W Magnetic Skyrmions. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95466.

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In this chapter, results of our recent investigations on the structural, microstructural and magnetic properties of Cu-based Heusler alloys and MFe2O4 (M = Mn, Fe, Co, Ni, Cu, Zn) nanostructures will be discussed. The chapter is divided into two parts, the first part describes growth and different characterizations of Heusler alloys while in the second part magnetic properties of nano-ferrites are discussed. The Cu50Mn25Al25-xGax (x = 0, 2, 4, 8 and 10 at %) alloys have been synthesized in the form of ribbons. The alloys with x ≤ 8 show the formation of Heusler single phase of the Cu2MnAl structure. Further increase of Ga content gives rise to the formation of γ-Cu9Al4 type phase together with Cu2MnAl Heusler phase. The alloys are ferromagnetically ordered and the saturation magnetization (Ms) decreases slightly with increasing Ga concentration. Annealing of the ribbons significantly changes the magnetic properties of Cu50Mn25Al25-xGax alloys. The splitting in the zero field cooled (ZFC) and field cooled (FC) magnetization curves at low temperature has been observed for alloys. Another important class of material is Nanoferrites. The structural and magnetization behaviour of spinel MFe2O4 nanoferrites are quite different from that of bulk ferrites. X-ray diffraction study revealed spinel structure of MFe2O4 nanoparticles. The observed ferromagnetic behaviour of MFe2O4 depends on the nanostructural shape as well as ferrite inversion degree. The magnetic interactions in Ce doped CoFe2O4 are antiferromagnetic that was confirmed by zero field/field cooling measurements at 100 Oe. Log R (Ω) response measurement of MgFe2O4 thin film was taken for 10–90% relative humidity (% RH) change at 300 K.

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Streszczenia konferencji na temat "Cobalt ferrite thin film"

Xavier, Sheena, M. K. Jiji, Smitha Thankachan i E. M. Mohammed. "Effect of sintering temperature on the structural and electrical properties of cobalt ferrite nanoparticles". W OPTOELECTRONIC MATERIALS AND THIN FILMS: OMTAT 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4861992.

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Liu, C., M. Mustaqima, P. Yoo, D. Kim i B. Lee. "Unipolar resistive switching in spin-coated cobalt ferrite thin films". W 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157088.

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Sharma, Deepanshu, i Neeraj Khare. "Single phase cobalt ferrite thin films for tunable microwave filter". W NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917914.

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Sangeneni, Neelima, Navakanta Bhat i S. A. Shivashankar. "Superparamagnetic, nanocrystalline cobalt ferrite thin films as magnetic core of integrated RF inductors". W 2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2017. http://dx.doi.org/10.1109/nano.2017.8117347.

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Suthar, Mahesh, Komal Bapna, Kishor Kumar i B. L. Ahuja. "Structural study of Mg doped cobalt ferrite thin films on ITO coated glass substrate". W 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032982.

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Londo, Stephen, Robert Baker, Jakub Husek i Somnath Biswas. "DETERMINING THE PRESENCE OF SPIN DYNAMICS IN COBALT FERRITE THIN FILMS USING XUV-RA SPECTROSCOPY". W 74th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2019. http://dx.doi.org/10.15278/isms.2019.we03.

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Nongjai, R., S. Khan, H. Ahmad, I. Khan i K. Asokan. "Effect of deposition pressure on the structural and magnetic properties of cobalt ferrite thin films". W PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810614.

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Sangeneni, Neelima, Navakanta Bhat i S. A. Shivashankar. "Superparamagnetic, nanocrystalline cobalt nickel zinc ferrite thin films, deposited at sub-200°C for RF CMOS applications". W 2018 IEEE 2nd Electron Devices Technology and Manufacturing Conference (EDTM). IEEE, 2018. http://dx.doi.org/10.1109/edtm.2018.8421430.

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Ren, Shenqiang, i Manfred Wuttig. "Self-Assembled Highly Tunable Magnetoelectric". W ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-417.

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A magnetoelectric (ME) composite with controlled nanostructures is synthesized using co-assembly of two inorganic precursors with a block copolymer. This solution processed material consists of hexagonally arranged ferromagnetic cobalt ferrite [CoFe2O4, CFO] nano-cylinders within a matrix of ferroelectric lead zirconium titanate [Pb1.1(Zr0.53Ti0.47)O3, PZT] when thin films were prepared by spin coating. The initial magnetic permeability of the self-assembled CFO/PZT nano-composite changes by a factor of five through the application of 2.5 V.

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Wang, Li, Xue-qiong Su, Yi Lu i Jiang-bo Chen. "Pulsed laser deposited cobalt-doped ZnO thin film". W ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, redaktorzy Andreas Tünnermann, Zejin Liu, Pu Wang i Chun Tang. SPIE, 2013. http://dx.doi.org/10.1117/12.2030394.

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